EP0306899B1 - Method of making heat exchanger and hollow shape for such - Google Patents

Method of making heat exchanger and hollow shape for such Download PDF

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Publication number
EP0306899B1
EP0306899B1 EP88114538A EP88114538A EP0306899B1 EP 0306899 B1 EP0306899 B1 EP 0306899B1 EP 88114538 A EP88114538 A EP 88114538A EP 88114538 A EP88114538 A EP 88114538A EP 0306899 B1 EP0306899 B1 EP 0306899B1
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EP
European Patent Office
Prior art keywords
section
tubing
hollow
web
tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88114538A
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German (de)
French (fr)
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EP0306899A1 (en
Inventor
Richard Knoll, Jr.
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Norsk Hydro ASA
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Norsk Hydro ASA
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Publication date
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Priority to AT88114538T priority Critical patent/ATE70209T1/en
Publication of EP0306899A1 publication Critical patent/EP0306899A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
    • B21C35/02—Removing or drawing-off work
    • B21C35/023—Work treatment directly following extrusion, e.g. further deformation or surface treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/04—Reinforcing means for conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49384—Internally finned
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49391—Tube making or reforming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49393—Heat exchanger or boiler making with metallurgical bonding

Definitions

  • the invention relates to a method of forming a heat exchanger in particular a motor vehicle radiator and to a hollow section of tubing for use in such a method, as defined in the pre-characterising portion of Claims 1 and 6,7 respectively.
  • the pre-characterising portion of Claim 1 is based on the disclosure of the document US-A-3662582 Furthermore, from the EP-A-188314 or from the EP-A-186130 metallic hollow sections of tubings having an oval cross-section are known to be used for forming a heat exchanger.
  • the pre-characterising portion of Claims 6 and 7 is based on the disclosure of the document EP-A-188 314 Hitherto, radiators, in particular water radiators for internal-combustion engines of motor vehicles, have been made in Europe to about 20% from conventional brass and copper tubes and to about 80% from aluminium tubes.
  • Aluminium radiators which due to their higher efficiency and their lower weight are preferred to the radiators of brass and copper tubes, are made in the form of plug-type radiators with plugged aluminium tubes or using welded aluminium tubes.
  • the proportion of plug-type radiators of aluminium is about 50%, while the proportion of radiators of welded aluminium tubes is about 30%.
  • Radiators with welded aluminium tubes are in particular used in internal-combustion engines in which a high cooling power is required, as is the case in particular in engines for small trucks and high-performance engines for automobiles.
  • the welded tubes for such radiators are made in that metal sheets are rounded from strip metal and welded by pressure welding in the longitudinal direction at one side. These tubes have a flat profile, in contrast to the tubes for plug-type radiators which have a circular profile, and are coated on the outside with AlSi alloys. This silicon coating is applied during the rolling of the sheet metal itself prior to the round forming and serves to enable the welded tubes to be subsequently soldered to the water tank and the cooling fins.
  • This soldering of the welded flat tubes, which consist of e.g. an Al Mg Si 0.5 or an Al Mn alloy, to the water tank and the cooling fins of the same or similar material is made by brazing or hard soldering at a temperature above 450°C, in particular at 607 to 636°C, with the aid of flux or under vacuum without flux.
  • radiators hitherto having such welded flat tubes usually two tubes are arranged parallel to each other, each having a width of for example 22 mm.
  • This width means the outer dimension of the tubes in the direction of the larger major axis of the flat profile. It has, however, been found that the cooling efficiency increases with increasing outer diameter so that preferably only one flat tube with correspondingly larger width should be provided.
  • the flat tubes are laterally screwed and pressed to the fins before the soldering to obtain a continuous exactly defined area contact between the two components, and thereafter soldered in the furnace.
  • the method according to the present invention comprises the steps mentioned in the characterizing part of the patent claim 1.
  • the extruded metallic hollow section of tubing to be used in the method according to the present invention is constructed as it is stated in the claims 6 or 7.
  • Preferred embodiments of the hollow section of tubing are subject-matter of the patent claims 8 and 9.
  • the web ensures during a subsequent rolling of the shape that flat profiled tubes are formed, where the wide sides of the flat profile lie exactly parallel to another.
  • said web effects a rigidity of the shapes giving a better stability during the rolling or drawing operation and obtaining a higher dimensional stability with wide flat shapes.
  • a turbulator which, when used for example as water cooler, ensures a turbulent flow of the water circulating in the tubes, thus resulting in a lower flow rate of the water and a higher cooling efficiency.
  • the shapes made of aluminium or Al-alloy are provided with a zinc coating or a coating with an alloy on a zinc basis.
  • the resulting tubes may then be soft-soldered to the cooling fins at a temperature below 450°C, and this contributes to the dimensional stability of the tubes compared to hard-soldering of the welded tubes because at these temperatures by nature a reduced deformation of the aluminium material is to be expected.
  • FIG. 1 of the attached drawings An example of embodiment of the hollow shape according to the invention used for making a motor vehicle radiator by the method according to the invention is shown in Fig. 1 of the attached drawings.
  • two webs are formed which extend continuously from one inner face to the other transversely of the direction of the large major axis of the oval cross-section and in the longitudinal direction of the shape.
  • These transverse webs 2 have a thickness substantially equal to the wall thickness of the shape 1.
  • the transverse webs are provided with a preformed curvature in the transverse direction. As illustrated in Fig. 1B this curvature serves to cause the webs 2 to buckle in on rolling of the shape 1 illustrated in Fig. 1A so that the resulting half-circular webs 5 illustrated in Fig. 1B reinforce the flat arisen tube 3 as well as serving as turbulator for the water to be cooled flowing through.
  • the flat tube illustrated in Fig. 1B may have an outer dimension in the direction of the shorter major axis of 2 mm, the outer radius at the two sides remaining unchanged 1.2 mm.
  • the example of embodiment of the hollow shape according to the invention shown in Fig. 1A may have a width, i.e. outer dimension in the direction of the larger major axis, such that the flat tube illustrated in Fig. 1B has corresponding outer dimensions of for example 32 mm to 40 mm without the dimensional accuracy and exact fit being impaired by the following soldering operation.
  • a further example of embodiment of the hollow shape 1 according to the invention is shown, which comprises a single web protrusion 2 in the cavity which is integrally formed on an inner side of the shape.
  • the web 2 has a height which corresponds to the height of the interior of the flat tube in Fig. 2B after rolling. It is ensured in this manner that the two outer sides of the flat tube in Fig. 2B extend exactly parallel due to the support by the web 2.
  • the tube illustrated in Fig. 2A can for example have an outer dimension in the direction of the shorter major axis of 4 to 6 mm, a height of the web 2 of 1.6 mm and a wall thickness of 0.4 mm.
  • a flat tube 3 which is illustrated in Fig. 2B and has an outer dimension in the direction of the shorter major axis of 2.4 mm, a height of the interior of 1.6 mm and a width, i.e. an outer dimension in the direction of the larger major axis, of 32 mm.
  • the outer radius at the two sides is once again 1.2 mm.
  • Fig. 3 shows a third example of embodiment of the hollow shape 1 according to the invention which comprises two webs 2 which are integrally formed at an inner side of the shape 1 at a predetermined angle at the same distance apart and from the sides of the hollow shape 1. This angle is chosen so that the webs 2 in the rolled flat tube 3, which is shown in Fig. 3B, are perpendicular to the inner faces.
  • the webs 2 again have a height corresponding to the height of the interior of the flat tube 3 in Fig. 3B.
  • the remaining dimensions correspond to the dimensions of the example of embodiment illustrated in Fig. 2. Since in the example of embodiment illustrated in Fig. 3 two webs 2 are provided, a still greater stability of the tube results along with a more pronounced swirl formation, i.e.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Body Structure For Vehicles (AREA)
  • Extrusion Of Metal (AREA)

Abstract

Method of making a motor vehicle radiator in which extruded hollow shapes (1) of oval cross-section provided inwardly with at least one longitudinally extending web (2) lying transversely of the larger major axis of the oval cross-section, are reshaped, e.g. rolled under pressure to a cross-sectional form of a flat profile tube having two parallel sides, soldered to cooling fins and fitted into a radiator housing. The extruded hollow shape (1) of light metal with a substantial oval cross-section for use in this method comprising inwardly at least one web (2) which extends in the longitudinal direction of the shape (1) and transversely to the large major axis of the oval cross-section of the shape.

Description

  • The invention relates to a method of forming a heat exchanger in particular a motor vehicle radiator and to a hollow section of tubing for use in such a method, as defined in the pre-characterising portion of Claims 1 and 6,7 respectively.
  • From the US-A-3 662 582 a method of forming a heat exchanger is already known comprising forming hollow sections of tubing each having at least one longitudinally inwardly extending web reshaping each of said sections of tubing into respective flattened hollow tubes with two parallel sides and assembling said hollow tubes.
  • With this known method it is started from hollow sections of tubing having a round cross-section formed for example by brazing. The pre-characterising portion of Claim 1 is based on the disclosure of the document US-A-3662582
       Furthermore, from the EP-A-188314 or from the EP-A-186130 metallic hollow sections of tubings having an oval cross-section are known to be used for forming a heat exchanger. The pre-characterising portion of Claims 6 and 7 is based on the disclosure of the document EP-A-188 314
       Hitherto, radiators, in particular water radiators for internal-combustion engines of motor vehicles, have been made in Europe to about 20% from conventional brass and copper tubes and to about 80% from aluminium tubes.
  • Aluminium radiators, which due to their higher efficiency and their lower weight are preferred to the radiators of brass and copper tubes, are made in the form of plug-type radiators with plugged aluminium tubes or using welded aluminium tubes. The proportion of plug-type radiators of aluminium is about 50%, while the proportion of radiators of welded aluminium tubes is about 30%.
  • Radiators with welded aluminium tubes are in particular used in internal-combustion engines in which a high cooling power is required, as is the case in particular in engines for small trucks and high-performance engines for automobiles. The welded tubes for such radiators are made in that metal sheets are rounded from strip metal and welded by pressure welding in the longitudinal direction at one side. These tubes have a flat profile, in contrast to the tubes for plug-type radiators which have a circular profile, and are coated on the outside with AlSi alloys. This silicon coating is applied during the rolling of the sheet metal itself prior to the round forming and serves to enable the welded tubes to be subsequently soldered to the water tank and the cooling fins.
  • This soldering of the welded flat tubes, which consist of e.g. an Al Mg Si 0.5 or an Al Mn alloy, to the water tank and the cooling fins of the same or similar material is made by brazing or hard soldering at a temperature above 450°C, in particular at 607 to 636°C, with the aid of flux or under vacuum without flux.
  • Both these possibilities of soldering the welded tubes to the fins and the water tank involve serious problems. When soldering with a flux the environmental problems are serious because detrimental substances are liberated by the flux and being very aggressive to aluminium and iron sheet and must therefore be washed off the soldered radiator to prevent the latter corroding. Furthermore, the arisen fumes must also be removed from the air to prevent sheet metal possibly pressed in the vicinity for the vehicle bodyworks from being attacked. For this purpose air cleaning is necessary, which involves high costs. When soldering without flux said problems, due to detrimental substances, admittedly do not occur, but because this soldering must take place under vacuum and requires extremely accurate temperature control high costs are also involved. Due to the high temperature of the soldering under vacuum in addition only a short holding time in the soldering furnace is possible so that at the soldering joint a spot tends to be formed rather than an area contact, and this impairs the thermal conductivity at this point.
  • In radiators hitherto having such welded flat tubes usually two tubes are arranged parallel to each other, each having a width of for example 22 mm. This width means the outer dimension of the tubes in the direction of the larger major axis of the flat profile. It has, however, been found that the cooling efficiency increases with increasing outer diameter so that preferably only one flat tube with correspondingly larger width should be provided. In the manufacture of the radiators, however, the flat tubes are laterally screwed and pressed to the fins before the soldering to obtain a continuous exactly defined area contact between the two components, and thereafter soldered in the furnace. Due to the pressure on the flat tube in the pressing and the temperature obtaining in the furnace during soldering, however, a deformation (collapse) of the side faces of the flat profile occurs in the furnace because the aluminium becomes soft and sinks in due to the pressure applied. This effect occurs in particular due to the fact that the aluminium tubes have a very small wall thickness of for example only 0.4 mm.
  • Furthermore, after the soldering of the tubes and the fins the core of the radiator formed in this manner is fitted into the radiator housing or into a radiator bottom, and this operation must not cause any stress in the assembled radiator. However, due to the deformation of the components during soldering the necessary exact fit is difficult to achieve.
  • The problems regarding the collapse of the tubes and the lack of an exact fit become even more serious when for increasing the efficiency wider flat profile tubes are to be used. Due to the aforementioned deformation of the tubes during soldering the waste in production then increases, and because of the silicon coating of the tubes this leads to a further problem because these reject radiators cannot simply be scrapped.
  • It is therefore an object of the present invention to avoid the above problems and to provide a method of making heat exchangers, in particular a motor vehicle radiator and a hollow shape for use in such a method, by which high-performance radiators of aluminium with high efficiency can be made.
  • For this purpose the method according to the present invention comprises the steps mentioned in the characterizing part of the patent claim 1.
  • Preferred embodiments of the method according to the present invention are subject-matter of the patent claims 2 to 5.
  • The extruded metallic hollow section of tubing to be used in the method according to the present invention is constructed as it is stated in the claims 6 or 7. Preferred embodiments of the hollow section of tubing are subject-matter of the patent claims 8 and 9.
  • Thus, in the method according to the invention none of the welded tubes are used, but extruded hollow shapes provided by a conventional extrusion press or Conform machine, said shapes being provided with at least one web situated in the shape cavity having a triple function: Firstly, the web ensures during a subsequent rolling of the shape that flat profiled tubes are formed, where the wide sides of the flat profile lie exactly parallel to another. Secondly, said web effects a rigidity of the shapes giving a better stability during the rolling or drawing operation and obtaining a higher dimensional stability with wide flat shapes. At last it also represents a turbulator which, when used for example as water cooler, ensures a turbulent flow of the water circulating in the tubes, thus resulting in a lower flow rate of the water and a higher cooling efficiency.
  • Due to the webs provided in the hollow shapes tubes of greater outer diameter of up to 40 mm can thus be used for making a heat exchanger, in particular a motor vehicle radiator, with high efficiency.
  • In a particular embodiment of the shapes according to the invention the shapes made of aluminium or Al-alloy are provided with a zinc coating or a coating with an alloy on a zinc basis. The resulting tubes may then be soft-soldered to the cooling fins at a temperature below 450°C, and this contributes to the dimensional stability of the tubes compared to hard-soldering of the welded tubes because at these temperatures by nature a reduced deformation of the aluminium material is to be expected.
  • Hereinafter the invention will be described in more details and by examples of preferred embodiments with the aid of the attached drawings, Figs. 1-3, wherein:
    • Fig 1 is a first example of embodiment of the hollow shape according to the invention in the extruded state in Fig. 1A and in the rolled state as a finished tube in Fig. 1B.
    • Fig. 2 is a second example of embodiment of the hollow shape according to the invention in the extruded state in Fig. 2A and in the rolled state in Fig. 2B, and
    • Fig. 3 is a third example of embodiment of the hollow shape according to the invention in the extruded state in Fig. 3A and in the rolled sate in Fig. 3B.
  • An example of embodiment of the hollow shape according to the invention used for making a motor vehicle radiator by the method according to the invention is shown in Fig. 1 of the attached drawings. The shape 1 shown in Fig. 1A having an oval cross-section and made of aluminium alloy, e.g. of Al Mg Si 0.5 or Al Mn, has an oval cross-section with an outer diameter in the direction of the smaller major axis of for example 4 to 6 mm and an outer radius at the two outer sides of 1.2 mm. In the cavity of the shape two webs are formed which extend continuously from one inner face to the other transversely of the direction of the large major axis of the oval cross-section and in the longitudinal direction of the shape. These transverse webs 2 have a thickness substantially equal to the wall thickness of the shape 1. The transverse webs are provided with a preformed curvature in the transverse direction. As illustrated in Fig. 1B this curvature serves to cause the webs 2 to buckle in on rolling of the shape 1 illustrated in Fig. 1A so that the resulting half-circular webs 5 illustrated in Fig. 1B reinforce the flat arisen tube 3 as well as serving as turbulator for the water to be cooled flowing through. The flat tube illustrated in Fig. 1B may have an outer dimension in the direction of the shorter major axis of 2 mm, the outer radius at the two sides remaining unchanged 1.2 mm. The example of embodiment of the hollow shape according to the invention shown in Fig. 1A may have a width, i.e. outer dimension in the direction of the larger major axis, such that the flat tube illustrated in Fig. 1B has corresponding outer dimensions of for example 32 mm to 40 mm without the dimensional accuracy and exact fit being impaired by the following soldering operation.
  • In Fig. 2A a further example of embodiment of the hollow shape 1 according to the invention is shown, which comprises a single web protrusion 2 in the cavity which is integrally formed on an inner side of the shape. The web 2 has a height which corresponds to the height of the interior of the flat tube in Fig. 2B after rolling. It is ensured in this manner that the two outer sides of the flat tube in Fig. 2B extend exactly parallel due to the support by the web 2. The tube illustrated in Fig. 2A can for example have an outer dimension in the direction of the shorter major axis of 4 to 6 mm, a height of the web 2 of 1.6 mm and a wall thickness of 0.4 mm.
  • This gives after the rolling a flat tube 3 which is illustrated in Fig. 2B and has an outer dimension in the direction of the shorter major axis of 2.4 mm, a height of the interior of 1.6 mm and a width, i.e. an outer dimension in the direction of the larger major axis, of 32 mm. The outer radius at the two sides is once again 1.2 mm.
  • Finally, Fig. 3 shows a third example of embodiment of the hollow shape 1 according to the invention which comprises two webs 2 which are integrally formed at an inner side of the shape 1 at a predetermined angle at the same distance apart and from the sides of the hollow shape 1. This angle is chosen so that the webs 2 in the rolled flat tube 3, which is shown in Fig. 3B, are perpendicular to the inner faces. The webs 2 again have a height corresponding to the height of the interior of the flat tube 3 in Fig. 3B. The remaining dimensions correspond to the dimensions of the example of embodiment illustrated in Fig. 2. Since in the example of embodiment illustrated in Fig. 3 two webs 2 are provided, a still greater stability of the tube results along with a more pronounced swirl formation, i.e. turbulence, of the medium to be cooled flowing in the interior when the profile is used in a radiator so that still wider tube profiles can be used in a radiator so that still wider tube profiles can be employed and thus motor vehicle radiators made having extremely high efficiency, as required for example for the engines of commercial vehicles.
  • Although several preferred embodiments of the invention have been described it is apparent that modifications may be made therein by people skilled in the art. Such modifications may be made without departing from the scope of the invention as set forth in the appended claims, e.g. the hollow shapes can be made of other metals than the disclosed Al-alloy and with other configurations of the cross-section than the illustrated oval one.

Claims (9)

  1. A method of forming a heat exchanger comprising
    - forming hollow sections of tubing each having at least one longitudinally inwardly extending web,
    - reshaping each of said sections of tubing into respective flattened hollow tubes with two parallel sides and
    - assembling said hollow tubes
    characterized in that
    - the hollow sections of tubing are formed by extruding and each have an oval cross-section with predetermined radii of curvature at the outer sides in the direction of the larger major axis, the web extending in a direction transverse to the larger major axis,
    - said hollow sections of tubing are reshaped such that the web forms an internal partition that establishes a predetermined transverse width of the hollow tubes and
    - the hollow tubes are assembled to external cooling fins thereby forming a heat exchanger core.
  2. A method according to claim 1, characterized in that the hollow sections of tubing are reshaped while said predetermined radii of curvature are maintained whereby the radii of curvature of the flattened hollow tubes remain the same as those formed in the step of extrusion.
  3. A method according to claim 1, characterized in that hollow sections of tubing of aluminium or aluminium alloy are extruded.
  4. A method according to claim 3, characterized in that the hollow tubes are coated with zinc or an alloy on a zinc basis and thereafter soldered to the coolling fins, and the assembly of tubes and cooling fins is fitted into a radiator housing.
  5. A method according to claim 4, characterized in that the tubes coated with zinc are soft-soldered to the cooling fins at a temperature below 450°C.
  6. Extruded metallic hollow section (1) of tubing having an oval cross-section for use in the method according to claim 1, characterized in that the cavity of the section of tubing is provided with at least one web (2) integrally formed and inwardly extending in the longitudinal direction of the hollow section (1) and situated transversely to the larger major axis of the oval cross-section of the section of tubing, the web (2) being made integrally extending from one inner face to the other inner face of the hollow section (1) and being provided with a curvature in the transverse direction of the section (1).
  7. Extruded metallic hollow section (1) of tubing having an oval cross-section for use in the method according to claim 1, characterized in that the cavity of the section of tubing is provided with at least one web (2) integrally formed and inwardly extending in the longitudinal direction of the hollow section (1) and situated transversely to the large major axis of the oval cross-section of the section of tubing, the web (2) being formed integrally on one inner face of the hollow section of tubing (1) and having a height which is equal to the desired height of the interior space which the tube is to have after the reshaping into a flat tube (3).
  8. A section of tubing according to claim 7, characterized in that the web (2) is provided protruding in the center of the section (1) in the direction of the larger major axis.
  9. A section of tubing according to claim 7, characterized in that two webs (2) are provided situated at the same distance from each other and from the section ends in the direction of the larger major axis.
EP88114538A 1987-09-08 1988-09-06 Method of making heat exchanger and hollow shape for such Expired - Lifetime EP0306899B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88114538T ATE70209T1 (en) 1987-09-08 1988-09-06 METHOD OF MANUFACTURING A HEAT EXCHANGER AND A HOLLOW PROFILE THEREOF.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3730117A DE3730117C1 (en) 1987-09-08 1987-09-08 Method for producing a heat exchanger, in particular a motor vehicle radiator and tube profile for use in such a method
DE3730117 1987-09-08

Publications (2)

Publication Number Publication Date
EP0306899A1 EP0306899A1 (en) 1989-03-15
EP0306899B1 true EP0306899B1 (en) 1991-12-11

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EP88114538A Expired - Lifetime EP0306899B1 (en) 1987-09-08 1988-09-06 Method of making heat exchanger and hollow shape for such

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US (1) US5058266A (en)
EP (1) EP0306899B1 (en)
JP (1) JPH01104427A (en)
KR (1) KR960006994B1 (en)
CN (1) CN1020870C (en)
AT (1) ATE70209T1 (en)
BR (1) BR8804617A (en)
CA (1) CA1313752C (en)
DE (2) DE3730117C1 (en)
ES (1) ES2027359T3 (en)
MX (1) MX169807B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234006A1 (en) * 1992-10-09 1994-04-14 Mtu Muenchen Gmbh Profile tube for heat exchangers
DE19733275A1 (en) * 1997-08-01 1999-02-11 Univ Dresden Tech Inserts for fluid flow passages used in e.g. heat exchange systems

Families Citing this family (69)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448183A3 (en) * 1988-09-14 1991-10-16 Showa Aluminum Kabushiki Kaisha A condenser
NO173538C (en) * 1991-09-06 1993-12-29 Norsk Hydro As Construction beam and method of production of the same
JP3364665B2 (en) * 1993-03-26 2003-01-08 昭和電工株式会社 Refrigerant flow pipe for heat exchanger
JPH06300473A (en) * 1993-04-19 1994-10-28 Sanden Corp Flat refrigerant pipe
US5353639A (en) * 1993-05-20 1994-10-11 Thermalex, Inc. Method and apparatus for sizing multiple tubes
US5784776A (en) * 1993-06-16 1998-07-28 Showa Aluminum Corporation Process for producing flat heat exchange tubes
KR950011141A (en) * 1993-10-06 1995-05-15 김언식 Automatic chalk eraser
DE4446754A1 (en) * 1994-12-24 1996-06-27 Behr Gmbh & Co Method for construction of heat exchanger
JP3023657B2 (en) * 1995-09-25 2000-03-21 本田技研工業株式会社 Rear swing arm of motorcycle
US5687604A (en) * 1996-05-30 1997-11-18 Exco Technologies Ltd. Thermal controlled mandrel with replaceable tip for copper and brass extrusion
US6029353A (en) * 1997-06-05 2000-02-29 Anodizing, Inc. Method and products produced from splitting multi-void hollow tubing
JP3223166B2 (en) * 1997-08-26 2001-10-29 エルジー電子株式会社 refrigerator
AU9766098A (en) * 1998-10-20 2000-05-08 Reynolds Aluminium Holland B.V. Method for the production of multi-channel tubes; multi-channel tubes obtained in this way; and an extrusion die and installation for carrying out the method
AU2721999A (en) * 1999-01-28 2000-08-18 Norsk Hydro Asa Flat oval tube
US6192978B1 (en) * 1999-10-27 2001-02-27 Brazeway, Inc. Micro-multiport (MMP) tubing with improved metallurgical strength and method for making said tubing
US6536255B2 (en) 2000-12-07 2003-03-25 Brazeway, Inc. Multivoid heat exchanger tubing with ultra small voids and method for making the tubing
US20020195240A1 (en) * 2001-06-14 2002-12-26 Kraay Michael L. Condenser for air cooled chillers
US20030131976A1 (en) * 2002-01-11 2003-07-17 Krause Paul E. Gravity fed heat exchanger
TW588777U (en) * 2002-12-27 2004-05-21 Gordon Chih Water pipe with internal partition
US8162034B2 (en) * 2003-07-28 2012-04-24 Bonner Michael R Thermal inner tube
US20050087251A1 (en) * 2003-10-24 2005-04-28 Yoshiyuki Sumitomo Hose
US7562905B2 (en) * 2003-11-21 2009-07-21 Raufoss Technology As Subframe for a vehicle and a method for its manufacture
US20050189096A1 (en) * 2004-02-26 2005-09-01 Wilson Michael J. Compact radiator for an electronic device
US20050269069A1 (en) * 2004-06-04 2005-12-08 American Standard International, Inc. Heat transfer apparatus with enhanced micro-channel heat transfer tubing
US20080087408A1 (en) * 2004-08-31 2008-04-17 Takahide Maezawa Multi -Channeled Flat Tube And Heat Exchanger
CN100395506C (en) * 2004-12-23 2008-06-18 中国石油化工集团公司 Tube sheet type heat exchanger
US20090014165A1 (en) * 2006-01-19 2009-01-15 Werner Zobel Flat tube, flat tube heat exchanger, and method of manufacturing same
US8438728B2 (en) * 2006-01-19 2013-05-14 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
CN101405556B (en) * 2006-01-19 2013-03-20 摩丁制造公司 Flat tube, flat tube heat exchanger, and method of manufacturing same
US8434227B2 (en) 2006-01-19 2013-05-07 Modine Manufacturing Company Method of forming heat exchanger tubes
US8091621B2 (en) * 2006-01-19 2012-01-10 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8191258B2 (en) * 2006-01-19 2012-06-05 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US20090019696A1 (en) * 2006-01-19 2009-01-22 Werner Zobel Flat tube, flat tube heat exchanger, and method of manufacturing same
US8281489B2 (en) * 2006-01-19 2012-10-09 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US7921559B2 (en) * 2006-01-19 2011-04-12 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
JP2009524002A (en) * 2006-01-19 2009-06-25 モーディーン・マニュファクチャリング・カンパニー Flat tube, flat tube heat exchanger, and method for manufacturing the same
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DE102007004993A1 (en) 2007-02-01 2008-08-07 Modine Manufacturing Co., Racine Production process for flat tubes and roller mill
US8113269B2 (en) * 2007-02-22 2012-02-14 Thomas & Betts International, Inc. Multi-channel heat exchanger
JP4671985B2 (en) * 2007-04-10 2011-04-20 三菱電機株式会社 Heat exchanger and air conditioner equipped with the heat exchanger
WO2009089460A2 (en) * 2008-01-09 2009-07-16 International Mezzo Technologies, Inc. Corrugated micro tube heat exchanger
EP2242979B1 (en) * 2008-01-10 2014-09-24 Behr GmbH & Co. KG Extruded tube for a heat exchanger
JP4836996B2 (en) * 2008-06-19 2011-12-14 三菱電機株式会社 Heat exchanger and air conditioner equipped with the heat exchanger
US8177932B2 (en) 2009-02-27 2012-05-15 International Mezzo Technologies, Inc. Method for manufacturing a micro tube heat exchanger
JP5094771B2 (en) * 2009-03-16 2012-12-12 三菱電機株式会社 Manufacturing method of heat exchanger and air conditioner using the heat exchanger
DE102009055608A1 (en) * 2009-11-25 2011-05-26 Behr Gmbh & Co. Kg Brazed aluminum heat exchanger
FR2956949B1 (en) 2010-03-04 2013-04-19 Pelle Equipements COOKING DEVICE FOR FOOD PRODUCTS BASED ON PASTE AND COOKING FILET.
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DE102010023384B4 (en) 2010-06-10 2014-08-28 Modine Manufacturing Co. Manufacturing process, in particular for pipes and tear-off device
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MX356024B (en) * 2012-09-14 2018-05-09 Revent Int Ab Hot air oven.
US8887398B1 (en) * 2013-04-29 2014-11-18 Tesla Motors, Inc. Extruded member with altered radial fins
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US20230314093A1 (en) * 2022-03-31 2023-10-05 Deere & Company Heat exchanger
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4579605A (en) * 1984-02-14 1986-04-01 Furukuwa Aluminum Co., Ltd. Flux for brazing the aluminum parts and preparing method of the same
EP0186130A2 (en) * 1984-12-22 1986-07-02 Mtu Motoren- Und Turbinen-Union MàœNchen Gmbh Method of producing ringshaped members for cylindrical collecting pipe structures of heat exchangers
EP0188314A2 (en) * 1985-01-18 1986-07-23 Ford Motor Company Limited Method of attaching a tube to a fin

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151540A (en) * 1935-06-19 1939-03-21 Varga Alexander Heat exchanger and method of making same
US2096272A (en) * 1935-07-15 1937-10-19 Young Radiator Co Turbulence means for radiator tubes
US2401542A (en) * 1944-04-03 1946-06-04 Noblitt Sparks Ind Inc Process for making tubing
US2759246A (en) * 1954-12-08 1956-08-21 Olin Mathieson Method of making hollow articles
US3596495A (en) * 1969-04-01 1971-08-03 Modine Mfg Co Heat transfer device and method of making
US3603384A (en) * 1969-04-08 1971-09-07 Modine Mfg Co Expandable tube, and heat exchanger
US3662582A (en) * 1970-05-18 1972-05-16 Noranda Metal Ind Heat-exchange tubing and method of making it
DE2209325C3 (en) * 1970-05-18 1978-08-03 Noranda Metal Industries Inc., Bellingham, Wash. (V.St.A.) Heat exchange tube
US3625257A (en) * 1970-07-15 1971-12-07 Modine Mfg Co Fluid flow tube
CH587465A5 (en) * 1974-11-27 1977-04-29 Famurano Anstalt
FR2390274A1 (en) * 1977-05-13 1978-12-08 Michelin & Cie METHOD OF MANUFACTURING RODS FOR TIRES
US4352450A (en) * 1980-09-19 1982-10-05 Edgington Robert E Method for soldering aluminum
US4360958A (en) * 1981-01-12 1982-11-30 Kritzer Richard W Method of making heat exchangers
US4615952A (en) * 1982-10-29 1986-10-07 Norsk Hydro A.S. Aluminum shapes coated with brazing material and process of coating
US4512069A (en) * 1983-02-04 1985-04-23 Motoren-Und Turbinen-Union Munchen Gmbh Method of manufacturing hollow flow profiles
JPS6015064A (en) * 1983-07-06 1985-01-25 Hitachi Ltd Heat exchanger
JPH0616938B2 (en) * 1986-04-25 1994-03-09 三菱アルミニウム株式会社 Reactive soldering method
JPS63108914A (en) * 1986-10-27 1988-05-13 Kobe Steel Ltd Manufacture of multihole flat copper tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4579605A (en) * 1984-02-14 1986-04-01 Furukuwa Aluminum Co., Ltd. Flux for brazing the aluminum parts and preparing method of the same
EP0186130A2 (en) * 1984-12-22 1986-07-02 Mtu Motoren- Und Turbinen-Union MàœNchen Gmbh Method of producing ringshaped members for cylindrical collecting pipe structures of heat exchangers
EP0188314A2 (en) * 1985-01-18 1986-07-23 Ford Motor Company Limited Method of attaching a tube to a fin

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234006A1 (en) * 1992-10-09 1994-04-14 Mtu Muenchen Gmbh Profile tube for heat exchangers
DE19733275A1 (en) * 1997-08-01 1999-02-11 Univ Dresden Tech Inserts for fluid flow passages used in e.g. heat exchange systems
DE19733275C2 (en) * 1997-08-01 2001-02-08 Univ Dresden Tech Regenerator or adsorber for heat and / or mass transfer and storage in laminar flow conditions

Also Published As

Publication number Publication date
DE3866830D1 (en) 1992-01-23
ATE70209T1 (en) 1991-12-15
MX169807B (en) 1993-07-27
EP0306899A1 (en) 1989-03-15
DE3730117C1 (en) 1988-06-01
US5058266A (en) 1991-10-22
JPH01104427A (en) 1989-04-21
CN1020870C (en) 1993-05-26
KR890004786A (en) 1989-05-10
KR960006994B1 (en) 1996-05-27
CA1313752C (en) 1993-02-23
BR8804617A (en) 1990-05-01
CN1033019A (en) 1989-05-24
ES2027359T3 (en) 1992-06-01

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